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/*
 * Copyright (C) 2009 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing;

import static java.util.Collections.sort;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import junit.framework.Assert;
import junit.framework.AssertionFailedError;

@GwtCompatible(emulated = true)
public class Helpers {
  // Clone of Objects.equal
  static boolean equal(Object a, Object b) {
    return a == b || (a != null && a.equals(b));
  }

  // Clone of Lists.newArrayList
  public static  List copyToList(Iterable elements) {
    List list = new ArrayList();
    addAll(list, elements);
    return list;
  }

  public static  List copyToList(E[] elements) {
    return copyToList(Arrays.asList(elements));
  }

  // Clone of Sets.newLinkedHashSet
  public static  Set copyToSet(Iterable elements) {
    Set set = new LinkedHashSet();
    addAll(set, elements);
    return set;
  }

  public static  Set copyToSet(E[] elements) {
    return copyToSet(Arrays.asList(elements));
  }

  // Would use Maps.immutableEntry
  public static  Entry mapEntry(K key, V value) {
    return Collections.singletonMap(key, value).entrySet().iterator().next();
  }

  private static boolean isEmpty(Iterable iterable) {
    return iterable instanceof Collection
        ? ((Collection) iterable).isEmpty()
        : !iterable.iterator().hasNext();
  }

  public static void assertEmpty(Iterable iterable) {
    if (!isEmpty(iterable)) {
      Assert.fail("Not true that " + iterable + " is empty");
    }
  }

  public static void assertEmpty(Map map) {
    if (!map.isEmpty()) {
      Assert.fail("Not true that " + map + " is empty");
    }
  }

  public static void assertEqualInOrder(Iterable expected, Iterable actual) {
    Iterator expectedIter = expected.iterator();
    Iterator actualIter = actual.iterator();

    while (expectedIter.hasNext() && actualIter.hasNext()) {
      if (!equal(expectedIter.next(), actualIter.next())) {
        Assert.fail(
            "contents were not equal and in the same order: "
                + "expected = "
                + expected
                + ", actual = "
                + actual);
      }
    }

    if (expectedIter.hasNext() || actualIter.hasNext()) {
      // actual either had too few or too many elements
      Assert.fail(
          "contents were not equal and in the same order: "
              + "expected = "
              + expected
              + ", actual = "
              + actual);
    }
  }

  public static void assertContentsInOrder(Iterable actual, Object... expected) {
    assertEqualInOrder(Arrays.asList(expected), actual);
  }

  public static void assertEqualIgnoringOrder(Iterable expected, Iterable actual) {
    List exp = copyToList(expected);
    List act = copyToList(actual);
    String actString = act.toString();

    // Of course we could take pains to give the complete description of the
    // problem on any failure.

    // Yeah it's n^2.
    for (Object object : exp) {
      if (!act.remove(object)) {
        Assert.fail(
            "did not contain expected element "
                + object
                + ", "
                + "expected = "
                + exp
                + ", actual = "
                + actString);
      }
    }
    assertTrue("unexpected elements: " + act, act.isEmpty());
  }

  public static void assertContentsAnyOrder(Iterable actual, Object... expected) {
    assertEqualIgnoringOrder(Arrays.asList(expected), actual);
  }

  public static void assertContains(Iterable actual, Object expected) {
    boolean contained = false;
    if (actual instanceof Collection) {
      contained = ((Collection) actual).contains(expected);
    } else {
      for (Object o : actual) {
        if (equal(o, expected)) {
          contained = true;
          break;
        }
      }
    }

    if (!contained) {
      Assert.fail("Not true that " + actual + " contains " + expected);
    }
  }

  public static void assertContainsAllOf(Iterable actual, Object... expected) {
    List expectedList = new ArrayList<>();
    expectedList.addAll(Arrays.asList(expected));

    for (Object o : actual) {
      expectedList.remove(o);
    }

    if (!expectedList.isEmpty()) {
      Assert.fail("Not true that " + actual + " contains all of " + Arrays.asList(expected));
    }
  }

  public static  boolean addAll(Collection addTo, Iterable elementsToAdd) {
    boolean modified = false;
    for (E e : elementsToAdd) {
      modified |= addTo.add(e);
    }
    return modified;
  }

  static  Iterable reverse(final List list) {
    return new Iterable() {
      @Override
      public Iterator iterator() {
        final ListIterator listIter = list.listIterator(list.size());
        return new Iterator() {
          @Override
          public boolean hasNext() {
            return listIter.hasPrevious();
          }

          @Override
          public T next() {
            return listIter.previous();
          }

          @Override
          public void remove() {
            listIter.remove();
          }
        };
      }
    };
  }

  static  Iterator cycle(final Iterable iterable) {
    return new Iterator() {
      Iterator iterator = Collections.emptySet().iterator();

      @Override
      public boolean hasNext() {
        return true;
      }

      @Override
      public T next() {
        if (!iterator.hasNext()) {
          iterator = iterable.iterator();
        }
        return iterator.next();
      }

      @Override
      public void remove() {
        throw new UnsupportedOperationException();
      }
    };
  }

  static  T get(Iterator iterator, int position) {
    for (int i = 0; i < position; i++) {
      iterator.next();
    }
    return iterator.next();
  }

  static void fail(Throwable cause, Object message) {
    AssertionFailedError assertionFailedError = new AssertionFailedError(String.valueOf(message));
    assertionFailedError.initCause(cause);
    throw assertionFailedError;
  }

  public static  Comparator> entryComparator(
      final Comparator keyComparator) {
    return new Comparator>() {
      @Override
      @SuppressWarnings("unchecked") // no less safe than putting it in the map!
      public int compare(Entry a, Entry b) {
        return (keyComparator == null)
            ? ((Comparable) a.getKey()).compareTo(b.getKey())
            : keyComparator.compare(a.getKey(), b.getKey());
      }
    };
  }

  /**
   * Asserts that all pairs of {@code T} values within {@code valuesInExpectedOrder} are ordered
   * consistently between their order within {@code valuesInExpectedOrder} and the order implied by
   * the given {@code comparator}.
   *
   * @see #testComparator(Comparator, List)
   */
  public static  void testComparator(
      Comparator comparator, T... valuesInExpectedOrder) {
    testComparator(comparator, Arrays.asList(valuesInExpectedOrder));
  }

  /**
   * Asserts that all pairs of {@code T} values within {@code valuesInExpectedOrder} are ordered
   * consistently between their order within {@code valuesInExpectedOrder} and the order implied by
   * the given {@code comparator}.
   *
   * 
In detail, this method asserts
   *
   * 
    
   *   
  • reflexivity: {@code comparator.compare(t, t) = 0} for all {@code t} in {@code
   *       valuesInExpectedOrder}; and
   *   
  • consistency: {@code comparator.compare(ti, tj) < 0} and {@code
   *       comparator.compare(tj, ti) > 0} for {@code i < j}, where {@code ti =
   *       valuesInExpectedOrder.get(i)} and {@code tj = valuesInExpectedOrder.get(j)}.
   * 

   */
  public static  void testComparator(
      Comparator comparator, List valuesInExpectedOrder) {
    // This does an O(n^2) test of all pairs of values in both orders
    for (int i = 0; i < valuesInExpectedOrder.size(); i++) {
      T t = valuesInExpectedOrder.get(i);

      for (int j = 0; j < i; j++) {
        T lesser = valuesInExpectedOrder.get(j);
        assertTrue(
            comparator + ".compare(" + lesser + ", " + t + ")", comparator.compare(lesser, t) < 0);
      }

      assertEquals(comparator + ".compare(" + t + ", " + t + ")", 0, comparator.compare(t, t));

      for (int j = i + 1; j < valuesInExpectedOrder.size(); j++) {
        T greater = valuesInExpectedOrder.get(j);
        assertTrue(
            comparator + ".compare(" + greater + ", " + t + ")",
            comparator.compare(greater, t) > 0);
      }
    }
  }

  @SuppressWarnings({"SelfComparison", "SelfEquals"})
  public static > void testCompareToAndEquals(
      List valuesInExpectedOrder) {
    // This does an O(n^2) test of all pairs of values in both orders
    for (int i = 0; i < valuesInExpectedOrder.size(); i++) {
      T t = valuesInExpectedOrder.get(i);

      for (int j = 0; j < i; j++) {
        T lesser = valuesInExpectedOrder.get(j);
        assertTrue(lesser + ".compareTo(" + t + ')', lesser.compareTo(t) < 0);
        assertFalse(lesser.equals(t));
      }

      assertEquals(t + ".compareTo(" + t + ')', 0, t.compareTo(t));
      assertTrue(t.equals(t));

      for (int j = i + 1; j < valuesInExpectedOrder.size(); j++) {
        T greater = valuesInExpectedOrder.get(j);
        assertTrue(greater + ".compareTo(" + t + ')', greater.compareTo(t) > 0);
        assertFalse(greater.equals(t));
      }
    }
  }

  /**
   * Returns a collection that simulates concurrent modification by having its size method return
   * incorrect values. This is useful for testing methods that must treat the return value from
   * size() as a hint only.
   *
   * @param delta the difference between the true size of the collection and the values returned by
   *     the size method
   */
  public static  Collection misleadingSizeCollection(final int delta) {
    // It would be nice to be able to return a real concurrent
    // collection like ConcurrentLinkedQueue, so that e.g. concurrent
    // iteration would work, but that would not be GWT-compatible.
    return new ArrayList() {
      @Override
      public int size() {
        return Math.max(0, super.size() + delta);
      }
    };
  }

  /**
   * Returns a "nefarious" map entry with the specified key and value, meaning an entry that is
   * suitable for testing that map entries cannot be modified via a nefarious implementation of
   * equals. This is used for testing unmodifiable collections of map entries; for example, it
   * should not be possible to access the raw (modifiable) map entry via a nefarious equals method.
   */
  public static  Entry nefariousMapEntry(final K key, final V value) {
    return new Entry() {
      @Override
      public K getKey() {
        return key;
      }

      @Override
      public V getValue() {
        return value;
      }

      @Override
      public V setValue(V value) {
        throw new UnsupportedOperationException();
      }

      @SuppressWarnings("unchecked")
      @Override
      public boolean equals(Object o) {
        if (o instanceof Entry) {
          Entry e = (Entry) o;
          e.setValue(value); // muhahaha!

          return equal(this.getKey(), e.getKey()) && equal(this.getValue(), e.getValue());
        }
        return false;
      }

      @Override
      public int hashCode() {
        K k = getKey();
        V v = getValue();
        return ((k == null) ? 0 : k.hashCode()) ^ ((v == null) ? 0 : v.hashCode());
      }

      @Override
      public String toString() {
        return getKey() + "=" + getValue();
      }
    };
  }

  static  List castOrCopyToList(Iterable iterable) {
    if (iterable instanceof List) {
      return (List) iterable;
    }
    List list = new ArrayList();
    for (E e : iterable) {
      list.add(e);
    }
    return list;
  }

  private static final Comparator NATURAL_ORDER =
      new Comparator() {
        @SuppressWarnings("unchecked") // assume any Comparable is Comparable
        @Override
        public int compare(Comparable left, Comparable right) {
          return left.compareTo(right);
        }
      };

  public static  Iterable> orderEntriesByKey(
      List> insertionOrder) {
    sort(insertionOrder, Helpers.entryComparator(NATURAL_ORDER));
    return insertionOrder;
  }

  /**
   * Private replacement for {@link com.google.gwt.user.client.rpc.GwtTransient} to work around
   * build-system quirks.
   */
  private @interface GwtTransient {}

  /**
   * Compares strings in natural order except that null comes immediately before a given value. This
   * works better than Ordering.natural().nullsFirst() because, if null comes before all other
   * values, it lies outside the submap/submultiset ranges we test, and the variety of tests that
   * exercise null handling fail on those subcollections.
   */
  public abstract static class NullsBefore implements Comparator, Serializable {
    /*
     * We don't serialize this class in GWT, so we don't care about whether GWT will serialize this
     * field.
     */
    @GwtTransient private final String justAfterNull;

    protected NullsBefore(String justAfterNull) {
      if (justAfterNull == null) {
        throw new NullPointerException();
      }

      this.justAfterNull = justAfterNull;
    }

    @Override
    public int compare(String lhs, String rhs) {
      if (lhs == rhs) {
        return 0;
      }
      if (lhs == null) {
        // lhs (null) comes just before justAfterNull.
        // If rhs is b, lhs comes first.
        if (rhs.equals(justAfterNull)) {
          return -1;
        }
        return justAfterNull.compareTo(rhs);
      }
      if (rhs == null) {
        // rhs (null) comes just before justAfterNull.
        // If lhs is b, rhs comes first.
        if (lhs.equals(justAfterNull)) {
          return 1;
        }
        return lhs.compareTo(justAfterNull);
      }
      return lhs.compareTo(rhs);
    }

    @Override
    public boolean equals(Object obj) {
      if (obj instanceof NullsBefore) {
        NullsBefore other = (NullsBefore) obj;
        return justAfterNull.equals(other.justAfterNull);
      }
      return false;
    }

    @Override
    public int hashCode() {
      return justAfterNull.hashCode();
    }
  }

  public static final class NullsBeforeB extends NullsBefore {
    public static final NullsBeforeB INSTANCE = new NullsBeforeB();

    private NullsBeforeB() {
      super("b");
    }
  }

  public static final class NullsBeforeTwo extends NullsBefore {
    public static final NullsBeforeTwo INSTANCE = new NullsBeforeTwo();

    private NullsBeforeTwo() {
      super("two"); // from TestStringSortedMapGenerator's sample keys
    }
  }

  @GwtIncompatible // reflection
  public static Method getMethod(Class clazz, String name) {
    try {
      return clazz.getMethod(name);
    } catch (Exception e) {
      throw new IllegalArgumentException(e);
    }
  }
}
 















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